In August 2008, AdEdge Water Technologies was contacted by engineering firm Bohannan Huston to design, supply and start up an arsenic and iron removal system for the Desert Sands MDWCA Well #4 in Anthony, New Mexico. The water chemistry had an arsenic level of 17 to 20 parts per billion (ppb) and a naturally occurring iron level of 1 mg/L that would facilitate co-precipitation and removal of the arsenic.
AdEdge was selected for the project after Pete Gomez, operator of Desert Sands MDWCA, visited one of our treatment systems in Springfield, Ohio. “That impressed me, so that is one of the major reasons we selected AdEdge Technologies,” said Gomez.
The AdEdge treatment system featured a skid-mounted AD26 oxidation and filtration package unit rated for a maximum design flow of 450 gpm. The model, APU26-6660CS-3-AVH, utilizes the AdEdge AD26 GS+ media in a three-vessel configuration series. Sodium hypochlorite is fed into the system prior to the injection of ferric chloride to oxidize any arsenic (III) to arsenic (V) for optimized removal. The system is fully equipped with automated control valves and harness, central control panel with programmable logic controller (PLC) and a color user interface screen. System features also include differential pressure switches, control panels and local gauges, flow sensors and totalizers, and a central hydraulic panel with sample ports for a complete functioning packaged unit. Each 66-inch diameter carbon steel treatment vessel contains approximately 48 cubic feet of AD26 GS+ oxidation filtration media.
From the treatment system, water feeds the storage tank and distributed to approximately 500 end users. The system started up and began operation in March 2010. “Of the samples taken to the labs, all our arsenic, it looks to be removed—from 17 parts down to no-detects,” said Gomez.
In addition to the arsenic being removed from the water, iron is also being removed, which benefits the community and the utility's O&M process of having red/yellow water calls.
Case Study Fast Facts
Client: Desert Sands MDWCA
Engineer: Bohannan Huston
Location: Anthony, New Mexico
Date: August 2008
Contaminant treated: Arsenic
Flow rate: 450 GPM